Shield pump electrical safety device capable of preventing condensate water

Abstract

The utility model provides a shield pump electrical safety device capable of preventing condensate water, and relates to the technical field of pumping equipment. According to the technical scheme, the shield pump comprises a shield pump body, a shield pump motor and a shield pump electric control system. The motor of the shield pump is communicated with the internal space of the electric control system of the shield pump, the closed space is provided with a gas circulation opening and a sealing cover matched with the gas circulation opening, and a gas circulation frame which is made of a thermosensitive sealing material and allows gas to pass through when the gas circulation frame is not heated is arranged between the gas circulation opening and the sealing cover. According to the shield pump electrical safety device capable of preventing condensate water, gas is allowed to flow inside and outside the internal space in a two-way mode, the functions of pumping out internal air and filling inert gas are achieved only through one gas circulation opening, the gap between the sealing cover and the gas circulation opening is filled with the heating gas circulation frame, complete sealing is achieved, and the sealing effect is good. Pressure difference is allowed to exist in inner space and outer space of equipment, sealing failure caused by the pressure difference is avoided, and air leakage caused by slight vibration of the equipment is prevented.

Description

Technical Field

[0001] The present application relates to the technical field of pumping equipment, and more specifically, to an electrical safety device for a shielded pump that is resistant to condensation water. Background Art

[0002] The canned pump is a pumping device with no leakage and good sealing performance. It eliminates the leakage problem of the shaft seal in the traditional centrifugal pump through a special design. The main feature of the canned pump is that there is a sealed shielding sleeve between its rotor and stator. The shielding sleeve completely isolates the working fluid of the pump from the motor part, thereby preventing the liquid from leaking into the environment or the motor part from being corroded. However, although the motor will not be affected by the working fluid under the action of the shielding sleeve, it is difficult to solve the problem of air condensation inside the motor. When the motor temperature is higher than the outside temperature and the working fluid temperature, condensation water is easy to condense on the inner wall of the motor. Condensation water may cause the insulation material inside the motor to get damp, reduce its insulation performance, and increase the risk of electrical short circuit or leakage. The long-term existence of condensation water may cause the metal parts inside the motor to rust and corrode, reduce the efficiency of the motor, and shorten its service life; condensation water may cause corrosion or short circuit of electrical connection points, causing electrical failures and affecting the normal operation of the motor. In order to solve the problem of motor condensation water, there are several technical solutions in the prior art:

[0003] (1) A Chinese invention patent with publication number CN102005846A discloses a motor with a valve core, which comprises a housing, a front cover and a rear cover. The housing, the front cover and the rear cover are connected to form a sealed motor cavity. The motor is provided with a valve core communicating with the motor cavity. A sealing member is provided at the connection between the valve core and the motor. When in use, the motor cavity is first evacuated through the valve core and then filled with nitrogen or an inert gas, thereby preventing condensation inside the motor.

[0004] (2) The Chinese utility model patent with publication number CN215681993U, anti-condensation motor, discloses that the junction box has a junction box cavity connected to the inside of the main body, which is sealed relative to the outside, and also includes an inert gas filling part. The connected junction box cavity and the main body cavity have an inflation valve, and the inert gas is filled into the motor main body cavity and the junction box cavity through the inflation valve to form an inert gas filling part. Similarly, by filling in inert gas, the motor and electrical components are prevented from malfunctioning due to condensation.

[0005] However, in the prior art, the operations of filling with inert gas and evacuating the air are both performed through a one-way airtight valve (valve core). There are two obvious problems with this design. First, the sealing method is that the equipment components are sealed in coordination, which is only a relative seal rather than a complete seal. When the internal components fail to cooperate, such as when encountering a temperature difference between hot and cold, the sealing effect will be reduced. High requirements are put forward for matching the thermal expansion coefficients of the component materials, the thermal conductivity of the components, and the uniformity of the working environment temperature. However, this requirement is difficult to achieve when the motor is used. At the same time, due to the influence of the micro-vibration of the motor, the leakage of the coordinated seal will increase significantly; second, the one-way valve ventilation means that at least two ventilation interfaces must be configured in the process of evacuating and filling with inert gas, which increases the complexity of the equipment. Based on the first problem, the added ventilation interface will increase the leakage. At the same time, this configuration does not allow a pressure difference between the inner and outer cavities. The one-way valves with opposite passages will have at least one sealing failure. However, the internal temperature of the motor is inconsistent with the ambient temperature, and the occurrence of this pressure difference is a normal phenomenon when the equipment is used. Utility Model Content

[0006] To solve the problems existing in the prior art, the technical solution adopted in this application is a canned pump electrical safety device for preventing condensation water, including a canned pump body, a canned pump motor and a canned pump electrical control system;

[0007] The internal spaces of the canned pump motor and the canned pump electronic control system are interconnected to form a closed space isolated from the outside air and the canned pump body. The closed space is provided with a gas flow port and a sealing cover used in conjunction with the gas flow port. A gas flow frame made of heat-sensitive sealing material is provided between the gas flow port and the sealing cover to allow gas to pass through when not heated.

[0008] Preferably, an overflow groove is provided at the bottom of the gas flow port.

[0009] Preferably, the material of the gas circulation rack is wax.

[0010] Preferably, the gas circulation rack is arranged between the sealing cover and the groove wall of the overflow groove.

[0011] Preferably, the gas flow port is arranged on the upper surface of the closed space, and the gas flow frame is located between the sealing cover and the upper surface of the closed space.

[0012] Preferably, the gas flow opening is arranged on the lower surface of the closed space.

[0013] Preferably, it also includes a gas exchanger used in conjunction with the anti-condensation water shielded pump electrical safety device, the gas exchanger includes a gas delivery pipe, and a heating device is provided at one end of the gas delivery pipe that contacts the gas flow port.

[0014] Preferably, the heating device comprises a hand-held handle and a heating ring, and the heating ring can be sleeved on the outside of the gas delivery pipe, the overflow groove and the sealing cover.

[0015] The beneficial effects of the utility model are:

[0016] 1. The internal spaces of the shielded pump motor and the shielded pump electronic control system are interconnected, and a gas flow port, a sealing cover and a gas flow frame made of a heat-sensitive sealing material are used to allow gas to flow in both directions inside and outside the internal space. The internal air can be extracted and filled with inert gas only through one gas flow port, avoiding the need to set up multiple one-way valves for gas circulation. After the gas is extracted and the inert gas is input, the gas flow frame is heated to melt it temporarily, filling the gap between the sealing cover and the gas flow port to achieve complete sealing, allowing a pressure difference to exist between the internal and external spaces of the equipment, and the seal will not fail due to the pressure difference, and it can also prevent leakage caused by slight vibration of the equipment.

[0017] 2. When the equipment is abnormally overheated, the melted gas flow rack forms a liquid seal at the overflow groove, continuing to maintain the sealing of the equipment without causing airtight failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments or the prior art description:

[0019] Figure 1 This is a schematic diagram of the overall structure of the electrical safety device for the shielded pump to prevent condensation water in this application (hidden gas circulation rack);

[0020] Figure 2 This is a three-dimensional schematic diagram of the gas flow port of Example 1 of the present application (partially enlarged);

[0021] Figure 3 This is a three-dimensional schematic diagram of the gas flow port of Example 1 of the present application (with the sealing cover hidden);

[0022] Figure 4 This is a three-dimensional schematic diagram of the sealing cover of Example 1 of the present application (enlarged);

[0023] Figure 5 This is a three-dimensional schematic diagram of the gas flow port of Example 2 of the present application (partially enlarged, including a heating device);

[0024] Figure 6 This is a schematic front view of the gas flow port of Example 2 of the present application (partially enlarged);

[0025] Figure 7 for Figure 6 AA section view;

[0026] Figure 8This is a front view of the gas flow port of Example 3 of the present application (partially enlarged);

[0027] Fig. 9 for Figure 8 BB cross-sectional view;

[0028] Explanation of the reference numerals: 1. Shielding sleeve; 2. Shielding sleeve end cover; 3. Rotor; 4. Stator core; 5. Motor coil; 6. Rotor main shaft; 7. Electrical control box; 8. Sealing cover; 9. Gas flow port; 10. Upper housing (partial) of shielded pump electrical control system; 11. Gas flow frame; 12. Fixed retaining ring; 13. Fixed tongue; 14. Overflow groove; 15. Lower housing (partial) of shielded pump motor; 16. Handle; 17. Heating ring. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] An anti-condensation water shielded pump electrical safety device provided in an embodiment of the present application is now described:

[0032] Example 1

[0033] like Figure 1-4 As shown, a canned pump electrical safety device for preventing condensation water includes a canned pump body, a canned pump motor and a canned pump electronic control system. Figure 1 A typical internal structure of a canned pump is shown, wherein the rotor 3 and the rotor main shaft 6 are separated from the canned pump motor by a shielding sleeve 1, and are separated from the impeller by the shielding sleeve end cover 2. The canned pump motor includes a stator core 4 and a motor coil 5, and the canned pump electronic control system is arranged in an electronic control box 7.

[0034] In the anti-condensation water shielded pump electrical safety device proposed in the present application, the internal spaces of the shielded pump motor and the shielded pump electronic control system are interconnected to form a closed space isolated from the outside air and the shielded pump body. The closed space is provided with a gas flow port 9 and a sealing cover 8 used in conjunction with the gas flow port 9. A gas flow frame 11 made of a heat-sensitive sealing material is provided between the gas flow port 8 and the sealing cover 9 to allow gas to pass through when not heated.

[0035] In this embodiment, the sealing cover 8 cooperates with the fixed retaining ring 12 provided on the outer wall of the gas circulation port 9 through the fixed tongue 13. When in use, the sealing cover 8 is buckled toward the gas circulation port 9, so that the fixed tongue 13 passes through the notch of the fixed retaining ring 12, and then the sealing cover 8 is rotated to make the position of the fixed tongue 13 coincide with the fixed retaining ring 12, thereby completing the fixation of the sealing cover 8 and the gas circulation port 9 and preventing the sealing cover 8 from being separated from the gas circulation port 9 by the attraction during the vacuuming process.

[0036] In this embodiment, the gas circulation rack 11 is arranged between the outer wall of the gas circulation port 9 and the sealing cover 8. When in use, the gas circulation rack 11 is first placed on the outer wall of the gas circulation port 9, the sealing cover 8 is buckled and fixed, and the negative pressure operation is performed on the anti-condensation water shielded pump electrical safety device at the gas circulation port 9 to make the internal connecting space of the shielded pump motor and the shielded pump electronic control system in a negative pressure state, and then inert gas is injected into it. During the gas extraction process, the gas in the closed space passes through the gas circulation port 7, the gap of the gas circulation rack 11 and the sealing cover 8 in turn, and the gas enters the closed space in the opposite order when the gas is injected. The inert gas injected in this embodiment is nitrogen. After the injection is completed, the outer wall of the sealing cover 8 is heated, and the heat is conducted to the gas circulation rack 11 through the outer wall of the sealing cover 8. The gas circulation rack 11 is melted by the heat and flows to the gap between the sealing cover 8 and the upper shell (partial) 10 of the shielded pump electronic control system. After heating for a period of time, the heating is stopped, and the gas circulation rack cools down and solidifies near the gap between the outer wall of the sealing cover and the upper shell (partial) 10 of the shielded pump electronic control system, tightly sealing the gap, so that the internal space of the shielded pump motor and the shielded pump electronic control system becomes a closed space completely isolated from the outside world. At this time, the interior is protected by nitrogen and the water vapor has been removed, so there is no risk of condensation.

[0037] The functions of extracting the internal air and filling in the inert gas are achieved through only one gas circulation port 9, avoiding the need to set up multiple one-way valves for gas circulation; complete sealing is achieved, allowing a pressure difference to exist between the internal and external spaces of the equipment, preventing sealing failure due to the pressure difference, and preventing leakage caused by slight vibration of the equipment.

[0038] Furthermore, if Figure 3As shown, the material of the gas circulation rack 11 is wax. Using wax as the material of the gas circulation rack 11 can complete the sealing of the internal space of the shielded pump motor and the shielded pump electronic control system at a lower heating temperature, protect the motor, and facilitate operation. The more specific material needs to be determined according to the shell temperature when the motor is used. Since the shielded pump motor has good heat dissipation performance, in this embodiment, the temperature of the corresponding shell is up to 60°C. Therefore, in this embodiment, vegetable wax is selected as the material of the gas circulation rack 11, and the melting point is between 70-90°C. As a similar choice, in the case of other shell temperatures, paraffin wax, vegetable wax, soybean wax and other materials can also be selected for use.

[0039] Furthermore, if Figure 3 As shown, the gas flow opening 9 is arranged on the upper surface of the closed space. The gas flow opening 9 is arranged on the upper surface of the closed space, which makes it easy to observe the state of the gas flow frame 9, accurately grasp the heating time, and judge the sealing effect of the gas flow frame 9.

[0040] Furthermore, if Figure 2 and Figure 3 As shown, a gas exchanger used in conjunction with the shielded pump electrical safety device for preventing condensation water is also included, and the gas exchanger includes a gas delivery pipe, and a heating device is provided at one end of the gas delivery pipe that contacts the gas flow port 9. When in use, the gas delivery pipe is connected to the outside of the sealing cover 8, and the gas in the internal space of the shielded pump motor and the shielded pump electronic control system is extracted, and then filled with nitrogen. After the filling is completed, the heating device is directly started to melt the gas flow frame 11, and the heating device is turned off after heating for a period of time, and the gas delivery pipe is removed after the gas flow frame 11 solidifies again.

[0041] Furthermore, if Figure 5 As shown, the heating device includes a hand-held handle 16 and a heating ring 17, and the heating ring 17 can be sleeved on the outside of the gas delivery pipe, the overflow groove 14 and the sealing cover 8. The specific size of the heating ring 17 is determined according to the actual design. In this embodiment, the inner diameter of the gas delivery pipe is larger than the outer diameter of the sealing cover 8, and the inner diameter of the heating ring 17 is larger than the outer diameter of the gas delivery pipe. This embodiment proposes a method for implementing a heating device, including a heating ring 17 and a hand-held handle 16. Before use, the heating device is first sleeved on the outside of the gas delivery pipe. After the negative pressure extraction and inert gas filling operations are completed, the heating ring 17 is started to complete the heating operation, and then the heating is stopped.

[0042] Example 2

[0043] like Figure 1 , 5, 6, and 7, the difference from Example 1 is that, in this embodiment, an overflow groove 14 is provided at the bottom of the gas flow port 9. When the material and heating time of the gas flow frame 9 cannot be precisely matched, the gas flow frame 9 may flow excessively after melting, and at the same time, bubbles may be generated, resulting in insufficient sealing. In this embodiment, an overflow groove 14 is provided to prevent the excessive flow of the melted gas flow frame 11, so that the gas flow frame 11 has a sufficient height to block the gap between the sealing cover 8 and the upper shell (partial) 10 of the shielded pump electrical control system after re-solidification, and at the same time prevent the gas flow frame 11 from contacting the external gas too quickly and causing too fast cooling, and give the liquid gas flow frame 11 enough low viscosity time to remove bubbles.

[0044] Furthermore, if Figure 1 , 5 As shown in FIGS. 6 and 7 , the gas circulation rack 11 is arranged between the sealing cover 8 and the groove wall of the overflow groove 14. When the overflow groove 14 is arranged, the wall of the overflow groove 14 and the space of the overflow groove 14 play a certain degree of heat insulation role. At this time, it is difficult to directly heat the outer wall of the overflow groove 14 and smoothly transfer the heat to the gas circulation rack 11 between the inner wall of the sealing cover 8 and the outer wall of the gas circulation port 9. Therefore, in this embodiment, the gas circulation rack 11 is arranged between the outer wall of the sealing cover 8 and the groove wall of the overflow groove 14, so that the gas circulation rack 11 can smoothly receive the heat conducted by the outer wall of the overflow groove 14.

[0045] Example 3

[0046] like Figure 1 , 7 , 8, and 9, the difference from Example 1 is that in this embodiment, the gas flow port 9 is arranged on the lower surface of the internal space between the canned pump motor and the canned pump electronic control system. Since the opening area of ​​the gas flow port 9 is limited, the gas flow port 9 is arranged on the lower surface of the closed space, and the overflow groove 14 is not provided, and the gas flow frame 11 can be prevented from excessively flowing after melting. Since the opening direction of the gas flow port 9 is opposite to that of Example 1, the positions of the gas flow frame 11, the fixed retaining ring 12, and the fixed tongue 13 are adjusted accordingly.

[0047] Specifically, in this embodiment, the gas flow port 9 is arranged at the lower shell (partial) 15 of the shielded pump motor. After the fixed tongue 13 completes the interlocking with the fixed retaining ring 12, the fixed tongue 13 is located at the top and the fixed retaining ring 12 is located at the bottom. The gas flow frame 11 is also arranged between the inner wall of the sealing cover 8 and the outer wall of the gas flow port 9. After the vacuuming and inflation actions are completed, the lower end of the sealing cover 8 is heated to melt the gas flow frame 11, and then the heating is stopped, and the sealing is achieved after the gas flow frame 11 solidifies again.

[0048] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A canned pump electrical safety device for preventing condensation water, comprising a canned pump body, a canned pump motor and a canned pump electronic control system, characterized in that: The internal spaces of the canned pump motor and the canned pump electronic control system are interconnected to form a closed space isolated from the outside air and the canned pump body. The closed space is provided with a gas flow port and a sealing cover used in conjunction with the gas flow port. A gas flow frame made of heat-sensitive sealing material is provided between the gas flow port and the sealing cover to allow gas to pass through when not heated.

2. The anti-condensation water shielded pump electrical safety device according to claim 1, characterized in that: An overflow groove is arranged at the bottom of the gas flow opening.

3. The anti-condensation water shielded pump electrical safety device according to claim 1, characterized in that: The material of the gas circulation rack is wax.

4. The anti-condensation water shielded pump electrical safety device according to claim 2, characterized in that: The gas circulation frame is arranged between the sealing cover and the groove wall of the overflow groove.

5. The anti-condensation water shielded pump electrical safety device according to claim 1, characterized in that: The gas flow port is arranged on the upper surface of the closed space, and the gas flow frame is located between the sealing cover and the upper surface of the closed space.

6. The anti-condensation water shielded pump electrical safety device according to claim 1, characterized in that: The gas flow opening is arranged on the lower surface of the closed space.

7. The anti-condensation water shielded pump electrical safety device according to any one of claims 2 to 6, characterized in that: It also includes a gas exchanger used in conjunction with the anti-condensation water shielded pump electrical safety device, the gas exchanger includes a gas delivery pipe, and a heating device is provided at one end of the gas delivery pipe that contacts the gas flow port.

8. The anti-condensation water shielded pump electrical safety device according to claim 7, characterized in that: The heating device comprises a hand-held handle and a heating ring, and the heating ring can be sleeved on the outside of the gas delivery pipe, the overflow groove and the sealing cover.

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